Documentation/ABI/testing/sysfs-class-led-flash

   1 What:           /sys/class/leds/<led>/flash_brightness
   2 Date:           March 2015
   3 KernelVersion:  4.0
   4 Contact:        Jacek Anaszewski <j.anaszewski@samsung.com>
   5 Description:    read/write
   6                 Set the brightness of this LED in the flash strobe mode, in
   7                 microamperes. The file is created only for the flash LED devices
   8                 that support setting flash brightness.
   9
  10                 The value is between 0 and
  11                 /sys/class/leds/<led>/max_flash_brightness.
  12
  13 What:           /sys/class/leds/<led>/max_flash_brightness
  14 Date:           March 2015
  15 KernelVersion:  4.0
  16 Contact:        Jacek Anaszewski <j.anaszewski@samsung.com>
  17 Description:    read only
  18                 Maximum brightness level for this LED in the flash strobe mode,
  19                 in microamperes.
  20
  21 What:           /sys/class/leds/<led>/flash_timeout
  22 Date:           March 2015
  23 KernelVersion:  4.0
  24 Contact:        Jacek Anaszewski <j.anaszewski@samsung.com>
  25 Description:    read/write
  26                 Hardware timeout for flash, in microseconds. The flash strobe
  27                 is stopped after this period of time has passed from the start
  28                 of the strobe. The file is created only for the flash LED
  29                 devices that support setting flash timeout.
  30
  31 What:           /sys/class/leds/<led>/max_flash_timeout
  32 Date:           March 2015
  33 KernelVersion:  4.0
  34 Contact:        Jacek Anaszewski <j.anaszewski@samsung.com>
  35 Description:    read only
  36                 Maximum flash timeout for this LED, in microseconds.
  37
  38 What:           /sys/class/leds/<led>/flash_strobe
  39 Date:           March 2015
  40 KernelVersion:  4.0
  41 Contact:        Jacek Anaszewski <j.anaszewski@samsung.com>
  42 Description:    read/write
  43                 Flash strobe state. When written with 1 it triggers flash strobe
  44                 and when written with 0 it turns the flash off.
  45
  46                 On read 1 means that flash is currently strobing and 0 means
  47                 that flash is off.
  48
  49 What:           /sys/class/leds/<led>/flash_fault
  50 Date:           March 2015
  51 KernelVersion:  4.0
  52 Contact:        Jacek Anaszewski <j.anaszewski@samsung.com>
  53 Description:    read only
  54                 Space separated list of flash faults that may have occurred.
  55                 Flash faults are re-read after strobing the flash. Possible
  56                 flash faults:
  57
  58                 * led-over-voltage
  59                         flash controller voltage to the flash LED
  60                         has exceeded the limit specific to the flash controller
  61                 * flash-timeout-exceeded
  62                         the flash strobe was still on when
  63                         the timeout set by the user has expired; not all flash
  64                         controllers may set this in all such conditions
  65                 * controller-over-temperature
  66                         the flash controller has
  67                         overheated
  68                 * controller-short-circuit
  69                         the short circuit protection
  70                         of the flash controller has been triggered
  71                 * led-power-supply-over-current
  72                         current in the LED power
  73                         supply has exceeded the limit specific to the flash
  74                         controller
  75                 * indicator-led-fault
  76                         the flash controller has detected
  77                         a short or open circuit condition on the indicator LED
  78                 * led-under-voltage
  79                         flash controller voltage to the flash
  80                         LED has been below the minimum limit specific to
  81                         the flash
  82                 * controller-under-voltage
  83                         the input voltage of the flash
  84                         controller is below the limit under which strobing the
  85                         flash at full current will not be possible;
  86                         the condition persists until this flag is no longer set
  87                 * led-over-temperature
  88                         the temperature of the LED has exceeded
  89                         its allowed upper limit